/*
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * Contributor(s):
 *   Lan Qiang <jameslan@gmail.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK *****
 */

#include "nsZipIOQueue.h"
#include "nsZipIOCommand.h"
#include "nsAutoLock.h"
#include "nsIRunnable.h"
#include "nsThreadUtils.h"

class nsZipIOWorker : public nsIRunnable
{
public:
    NS_DECL_ISUPPORTS
    NS_DECL_NSIRUNNABLE
};

NS_IMPL_THREADSAFE_ISUPPORTS1(nsZipIOWorker, nsIRunnable)

NS_IMETHODIMP nsZipIOWorker::Run()
{
	return NS_ERROR_NOT_INITIALIZED;
}

NS_IMPL_THREADSAFE_ISUPPORTS1(nsZipIOQueue, nsIZipIOQueue)

nsZipIOQueue::nsZipIOQueue()
	: mActionCount(0),
	  mHead(nsnull),
	  mRear(nsnull),
	  mLock(PR_NewLock())
{
}

nsZipIOQueue::~nsZipIOQueue()
{
	PR_DestroyLock(mLock);
}

NS_IMETHODIMP nsZipIOQueue::Init(nsIZipFileIO *zipIO)
{
	NS_ENSURE_ARG_POINTER(zipIO);

	mZipIO = zipIO;

	return NS_OK;
}

NS_IMETHODIMP nsZipIOQueue::GetZip(nsIZipFileIO * *aZip)
{
	NS_ENSURE_ARG_POINTER(aZip);

	NS_IF_ADDREF(*aZip = mZipIO);

	return NS_OK;
}

NS_IMETHODIMP nsZipIOQueue::GetPendingActionCount(PRUint32 *aCount)
{
	NS_ENSURE_ARG_POINTER(aCount);

	*aCount = mActionCount;

	return NS_OK;
}

NS_IMETHODIMP nsZipIOQueue::Start()
{
	if (!mHead) {
		// no pending request exists, then quit
		return NS_OK;
	}

	nsresult rv = NS_NewThread(getter_AddRefs(mWorkerThread),
			new nsZipIOWorker());
	NS_ENSURE_SUCCESS(rv, rv);

	return NS_ERROR_NOT_INITIALIZED;
}

NS_IMETHODIMP nsZipIOQueue::Test(const char *aEntryName, nsIZipIOQueueEventSink *aSink, nsIEventTarget *aEventTarget)
{
	NS_ENSURE_TRUE(mZipIO, NS_ERROR_NOT_INITIALIZED);

	nsZipIOCmdTest *cmd = new nsZipIOCmdTest(aEntryName);
	NS_ENSURE_TRUE(cmd, NS_ERROR_OUT_OF_MEMORY);

	nsresult  rv = PushCommand(cmd);
	NS_ENSURE_SUCCESS(rv, rv);

	return NS_OK;
}

NS_IMETHODIMP nsZipIOQueue::Extract(const char *zipEntry, nsIFile *outFile, nsIZipIOQueueEventSink *aSink, nsIEventTarget *aEventTarget)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP nsZipIOQueue::ExtractToStream(const char *zipEntry, nsIZipIOStreamEventSink *aSink, nsIEventTarget *aEventTarget)
{
	return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP nsZipIOQueue::AddEntryFromStream(const char *zipEntry, nsZipLevel compression, nsIZipIOStreamEventSink *aSink, nsIEventTarget *aEventTarget)
{
	return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP nsZipIOQueue::AddEntryFromFile(const char *zipEntry, nsIFile *inFile, nsZipLevel compression, nsIZipIOQueueEventSink *aSink, nsIEventTarget *aEventTarget)
{
	return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP nsZipIOQueue::RemoveEntries(nsIUTF8StringEnumerator *zipEntries, nsIZipIOQueueEventSink *aSink, nsIEventTarget *aEventTarget)
{
	return NS_ERROR_NOT_IMPLEMENTED;
}

nsresult nsZipIOQueue::PushCommand(nsZipIOCommand *cmd)
{
	NS_ENSURE_ARG_POINTER(cmd);

	nsAutoLock lock(mLock);

	if (mRear) {
		mRear->SetNext(cmd);
		mRear = cmd;
	} else {
		mHead = mRear = cmd;
	}

	return NS_OK;
}

nsresult nsZipIOQueue::PopCommand(nsZipIOCommand **cmd)
{
	NS_ENSURE_ARG_POINTER(cmd);

	nsAutoLock lock(mLock);

	*cmd = mHead;
	if (mHead) {
		mHead = mHead->GetNext();
		if (!mHead) {
			mRear = nsnull;
		}
	}

	return NS_OK;
}
